JPH11254906A - Tire for wheel of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire having an excellent advantage by disposing a cord having a length of a striplike element and forming a carcass ply. SOLUTION: Strip-like elements 13, 33 have each crown part 25 circumferentially disposed in an arranged relation each other and a side part 24 radially extending on a side wall of a tire. Each side part 24 of carcass plies 3, 31 is covered with side parts belonging to an adjacent disposed length. An annular structure body 4 which is provided with a pair of unextendable inserts 27, 28 forming annular bodies which are secured to the first carcass ply 3 and the second carcass ply 31, respectively and axially separated by an elastomer filled body 29 is mounted on the carcass ply 3. A belt structure body 5, a tread band 8 and a side wall 9 are combined with a carcass structure body 2 to form the tire 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tire for a vehicle wheel, comprising at least one carcass ply comprising thread-like elements each extending in a substantially U-shaped configuration around a profile in a cross section of the tire. And a carcass structure having a pair of circumferentially non-extendable annular structures each engaged near a respective circumferentially inner edge of the carcass ply; A belt structure attached to the carcass structure at a position, a tread band attached to the belt structure at a circumferentially outward position thereof, and at least a tread band attached to the carcass structure at both lateral side positions. The present invention relates to a tire including a pair of sidewalls.

[0002]

BACKGROUND OF THE INVENTION The manufacture of tires for vehicle wheels consists of one or more carcass plies having a generally annular configuration, the carcass plies having "bead cores" at both axial edges.
Forming a carcass structure that engages respective annularly non-stretchable annular reinforcing elements.

[0003] At a position circumferentially outward of the carcass structure, a belt structure is attached to the carcass structure, the belt structure comprising one or more belt strips in the form of a closed ring. The belt strip consists essentially of fiber or metal cords appropriately oriented with respect to each other and to cords belonging to adjacent carcass plies.

At present, a tread band of a suitably thick strip of elastomeric material is attached to the belt structure at a location circumferentially outward of the belt structure.

[0005] For the purposes of the present invention, the term "elastomeric material" refers to a whole of a rubber blend, that is, an assembly of base polymers suitably fused with any other type of mineral filler and / or additive. It should be pointed out what it means.

Finally, a pair of sidewalls are attached to both sides of the tire being manufactured. Each of the pair of sidewalls includes a so-called shoulder region located near a corresponding side edge of the tread band and a so-called bead located between corresponding so-called bead cores and a so-called bead. Cover part.

[0007]

According to the conventional manufacturing method, the components of the tire substantially described above are first manufactured separately from one another and then assembled during the tire manufacturing step.

[0008] For example, to produce one or more carcass plies associated with a bead core to form a carcass structure, first, longitudinally disposing them through extrusion and / or through a calendering process. There is a need to produce rubber coated fabrics made of continuous fibers or metal cords. The rubber-coated fabric is subjected to a cross-cutting process to produce a length of a predetermined size, and the predetermined lengths of the fabric are thereafter connected together to form parallel cords arranged in a transverse direction. To produce a continuous ribbon-like semi-finished product having

Next, the manufactured article is cut into a product having a length correlated with the circumferentially extending portion of the carcass to be manufactured.

Instead of producing a semi-finished product, the carcass structure is produced directly during the tire production step,
Manufacturing methods have recently been proposed.

For example, as an example of the state of the art most relevant to current technology, US Pat. No. 5,453,140, incorporated herein by reference, includes a single, previously wound reel. A method and apparatus for manufacturing a carcass ply starting from a cord is disclosed.

[0012]

SUMMARY OF THE INVENTION In accordance with the method and apparatus described in the above-mentioned patents, at each operating cycle of the apparatus, it is pulled from the reel by a power-driven idler roller and held taut by a pneumatic tensioning device. The cut cord is cut so that the length of the stretched portion set in advance becomes a dimension that can be obtained.

A cord of this length is picked up by a pick-up element mounted on a belt wound on a powered pulley so as to extend transversely on the outer surface of the toroidal support.

A belt-type bending member operating on both sides of the annular support engages the end of this length,
The cord length is radially attached to the toroidal support by a sliding element acting like a finger along the side of the cord length.

When the above-described operation cycle is repeated, the plurality of cord lengths are arranged circumferentially in a circumferential relationship until the entire circumferential extension of the annular support is covered.

Naturally, the annular support has a dual function,
That is, the function of adhering to the cord disposed on the layer so that the cord can be conveniently held in a fixed relationship, and the function of forming an air-impermeable inner liner in the completed tire. Has been previously coated with an unvulcanized rubber layer.

The tire manufactured by this manufacturing method is:
One or more carcass plies are each axially spaced and oriented radially of the axis of rotation of the tire.
It comprises an individual cord having one side portion and a crown portion extending between the side portions at a radially outward position.

In the production range of this carcass structure,
As can be seen from EP 0,664,231, near each of the tire beads, the ends of the individual cords forming the carcass ply are axially oriented with respect to the annular anchoring element forming said bead core. It is known that they are arranged in an order that appears alternately at both positions.

According to the present invention, it is remarkable if one or more carcass plies are formed in this tire production range by arranging the cords of the length of the strip-shaped elements instead of the individual cords. It has been found that significant advantages are achieved. Each of the cord lengths consists essentially of a layer of unvulcanized elastomeric material containing two or more parallel thread-like elements arranged longitudinally.

More particularly, the invention relates to a tire for a vehicle wheel, wherein at least one carcass ply is at least partially coated with at least one unvulcanized layer of elastomeric material. And a length of a plurality of strip-like elements consisting of at least two of said thread-like elements arranged parallel to each other, each of said strip-like elements being substantially U-shaped around a profile in a cross section of the tire. Two side portions that extend in accordance with the configuration and extend substantially in a plane perpendicular to the geometric rotational axis of the tire at locations axially spaced apart from each other, and radially outward between the side portions. A crown portion extending in one direction, the crown portions being arranged in a side-by-side relationship along a circumferential extension of the tire while the length of each strip-like element is reduced. Id portion, respectively, each by a side portion of at least one adjacent strip-like elements,
The present invention relates to a tire characterized in that it is partially covered.

More specifically, the side portions of the strip-like length converge with one another at the geometrical rotational axis of the tire.

The extent to which the side portions of the arrangement length cover each other is progressive from the maximum value at the radially inner end of the side portion to a value of zero in the transition region between the side portion and the crown portion. It is convenient to reduce it.

In one preferred solution, the individual strip-like lengths are arranged according to a circumferential distribution pitch corresponding to the width of the strip-like length itself.

In one possible alternative embodiment, the individual strip-like lengths are arranged according to a circumferential distribution pitch corresponding to a multiple of the width of the strip-like length.

Preferably, each of the strip-like lengths is
It has a width corresponding to a divisor of the circumferentially extending portion of the tire measured at its equatorial plane.

According to a further aspect of the invention, the strip-shaped side portion has a wide area near the inner circumferential edge of the carcass structure.

The thread-like elements included in each of the strip-like lengths are driven away from each other in the wide area.

In one preferred embodiment, each of the strip-like lengths has a width in the range from 3 mm to 20 mm and preferably comprises from 3 to 10 thread-like elements.

Advantageously, each of said threadlike elements comprises a fiber cord having a diameter in the range of 0.6 mm to 1.2 mm or a metal cord having a diameter in the range of 0.3 mm to 2.1 mm.

The thread-like element has a distance between the centers of at least 1.5 times the diameter of the thread-like element and at least six threads when measured circumferentially on the carcass structure at the central equatorial plane of the tire. It is preferably arranged in a strip-like length according to a density of thread-like elements / cm.

According to a further aspect of the invention, which may advantageously be employed independently of the features of the invention listed above, each of the non-stretchable annular structures is coaxial with the tire. A first annular insert in the form of a substantially annular body disposed adjacent to the inner circumferential edge of the first carcass ply and not extending in the circumferential direction, and extending in a concentric coil shape. A first annular insert having at least one elongate element formed therein, and a circumferential annular body disposed coaxially with the tire at a location axially spaced from the first annular insert. A second annular insert, non-extendable in a direction, wherein the second annular insert has at least one elongated element formed in a concentric coil and formed between the first and second annular anchoring elements; And the second ring And a filling body of tightly connected elastomeric material anchoring element.

[0032] The carcass structure preferably and advantageously comprises at least one second carcass ply externally attached to the first carcass ply.

The second carcass ply preferably has a thread-like element arranged in a direction intersecting with the thread-like element of the first carcass ply.

This second carcass ply is advantageously manufactured in the same way as the first carcass ply, and is arranged in a direction intersecting the strip-like length of the first carcass ply. , Each having a strip-like length.

This strip-like length, or in each case, the thread-like element of each of the carcass plies, is at an angle of 0 ° to 25 ° with respect to a plane radial to the geometrical axis of rotation of the tire. It is convenient to have a tilted direction.

[0036] Advantageously, the first annular insert can be mounted on the outer surface of the first carcass ply in contact therewith.

On the other hand, the second annular insert, which cannot be extended in the circumferential direction, can be attached to the inner surface of the second carcass ply in a state of being in contact with the inner surface.

Alternatively, a second non-stretchable circumferentially
May be attached to the outer surface of the second carcass ply in contact therewith. The second carcass plies each have a circumferentially inner portion interposed between the non-stretchable second annular insert belonging to the respective annular reinforcing structure and the filling body.

Preferably, the circumferentially non-stretchable second annular insert is provided to have a longer radial extension than the circumferentially non-stretchable first annular insert. .

The filling body of this elastomeric material is 70
Conveniently it has a hardness in the range of A Shore hardness between 0 ° and 92 °.

Also, the carcass structure may be made of at least one elastomeric material that is impermeable to air.
It may consist of two sealing layers or liners, said sealing layer covering said carcass ply inside the tire.

The above-mentioned sealing layer is preferably made of at least one ribbon-like band of an airtight elastomeric material, which extends as a coil arranged side by side along a profile in the cross section of the tire. .

[0043]

BRIEF DESCRIPTION OF THE DRAWINGS Further features and advantages will be best understood from the following detailed description of a preferred but non-limiting embodiment of a vehicle tire according to the present invention. The invention will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which:

Referring to the drawings, a tire for a vehicle wheel according to the present invention is indicated generally by the reference numeral 1.

The tire 1 substantially comprises a carcass structure 2 having at least one first carcass ply 3 having a substantially annular shape. A pair of non-stretchable annular structures 4 is engaged with the carcass ply by both circumferential edges thereof, and each of the pair of non-stretchable annular structures is usually formed when a tire is completed. It is arranged in an area called “tire bead”.

One or more belt strips 6a, 6b,
7 is attached to the carcass structure 2 at a position outside the carcass structure 2 in the circumferential direction. A toret band 8 is circumferentially superimposed on the belt structure 5, and a longitudinal and transverse cut portion 8a is formed in the toret band 8 according to a molding process performed simultaneously with vulcanization of the tire. . Further, the cut portion is arranged at a position where a desired “torret pattern” can be defined.

The tire also comprises a pair of so-called “sidewalls” 9 mounted laterally on both sides of the carcass structure 2.

The carcass structure 2 comprises a so-called “liner” consisting essentially of a sealing layer 10, ie a layer of an elastomeric material which is impermeable to air, which makes it possible to ensure a hermetic sealing of the inflated tire at its inner wall. Can be coated.

The assembly of the above listed components and the manufacture of one or more of the above described components is performed using an annular support 11 shown schematically in FIGS. The toroidal support has the same form as the inner wall of the tire to be manufactured.

In one preferred solution, the toroidal support 11 has a small dimension compared to the dimensions of the finished tire according to a linear amount which is preferably comprised between 2% and 5%. . The above linear quantities are merely exemplary values measured along the circumferential extension of the support itself at its equatorial plane XX, which coincides with the equatorial plane of the tire.

For the purposes of the present invention, the annular support 11, which is not described in detail because it is not particularly important and which is not described, takes the desired annular shape under inflated conditions and It may comprise a foldable drum or an inflatable chamber or bladder suitably reinforced to maintain its form.

[0052] After considering the above description, the manufacture of the tire 1 comprises, first of all, starting with the formation of the sealing layer, ie the liner 10, and optionally forming the carcass structure 2.

The liner 10 may be made of at least one of an airtight elastomeric material manufactured by an extruder and / or a calender located near the toroidal support itself.
It can be advantageously manufactured by winding one ribbon-like band 12 around the annular support 11 in the circumferential direction.
As can be seen from FIG. 1, the winding of the ribbon-shaped band 12 is generally performed as circumferential coils arranged continuously in a side-by-side relationship so as to be able to follow the profile of the cross section of the outer surface of the annular support 11. Will be

For the purposes of the description, the expression “profile in cross section” is used herein to refer to an annular support sectioned along a radial plane with respect to its geometrical axis of rotation, not shown in the drawing. 11 means the configuration indicated by the half-section, said radial surface coinciding with the geometrical axis of rotation of the tire to be manufactured.

Simultaneously with the winding of the ribbon-like band 12,
During that manufacturing step, a pair of auxiliary annular elements 12a can be mounted near the circumferential inner edge of the carcass structure. Each of these auxiliary annular elements 12a
For example, by winding the ribbon-shaped band 12 as a coil disposed axially side by side with a corresponding coil disposed on the annular support 11 or disposed on the inner circumferential edge of the liner 10 to be formed. Can be formed. Alternatively, the auxiliary annular element 12a may be formed by at least one auxiliary ribbon-like band formed from a respective extruder arranged on the annular support 11.

According to the invention, as will be explained more clearly below, a plurality of strip-like lengths 13 obtained from at least one continuous strip-like element 2a, which preferably has a width of 3 mm to 20 mm, By arranging on the annular support 11, the carcass ply 3
It is formed directly on the annular support 11.

As shown in FIG. 6, the formation of the continuous strip-shaped element 2 is based on a first extruder 16 associated with a supply of unvulcanized elastomeric material through the extruder itself. Two or more thread-like elements 1 supplied from each reel 14a through an extruder 15
It basically includes guiding 4, preferably 3 to 10 thread-like elements 14.

As used herein, the term "extruder" is intended to mean a part of an extruder which is also referred to in this particular field by the term "extrusion head". The extruder is provided with a so-called "die" through which the product to be machined passes through an exit port shaped and dimensioned according to the geometric and dimensional characteristics attached to the product itself. .

The elastomeric material and the thread-like element 14 are tightly connected together in an extruder 15, thereby forming a continuous strip-like element 2a at its outlet. The continuous strip-like element is formed of at least one layer of elastomeric material 17 of thickness in which the thread-like element itself is embedded.

Depending on the requirements, the threadlike element 14 can be guided in the extruder 15 as follows. That is, the thread-like element is not integrated into the layer of elastomeric material 17 but can be guided in such a way that it appears on one or both sides.

Each of the thread elements 14 is, for example, a fiber cord preferably having a diameter of 0.6 mm to 1.2 mm, or a metal preferably having a diameter of 0.3 mm to 2.1 mm. Each can be made of a cord.

If necessary, the thread elements 14 can be provided in such a way as to provide an unexpectedly compact and homogeneous quality to the carcass ply 3 thus formed. Is advantageously arranged in a continuous strip-like element 2a. For this purpose, the thread-like element 14 is, for example, an equatorial plane X-
When measured in the circumferential direction on the carcass ply 3 near X, it can be arranged according to the density of 6 or more thread-like elements per cm. In any case, the thread-like elements 14 are arranged according to a mutual distance between centers of at least 1.5 times the diameter of the thread-like elements themselves so that a suitable rubber coating step can be performed between adjacent threads. Is preferably arranged in the strip-shaped element 2a.

The continuous strip-shaped element 2a discharged from the extruder 15 is optionally provided with a first accumulator-correction device 18 on a positioning device 19 schematically shown in FIGS. It is advantageous to guide through.

The arrangement device 19 basically has a first guide member 20. The first guide member is, for example,
Downstream of the accumulator-correction device 18, the continuous strip-shaped element 2 produced by the extruder 15
a first guide member 20 consisting of a pair of opposing rollers intended to engage a.

Downstream of the first guide member 20, the strip-shaped element 2a engages with the first gripping member 21. The first gripping member 21 is provided on the equatorial plane XX of the annular support 11.
It is movable in the direction determined transversely with respect to.

More specifically, the first gripping member 21 is movable between a first operating position and a second operating position,
In the first operating position, as shown in FIG. 2, the first gripper engages one end of a continuous strip-like element 2a near a first guide consisting of opposed rollers 20. In the second operating position, as shown in FIG. 3, the first gripping member moves away from the first guide member to move the continuous strip-shaped element 2a into the annular support 11. In the transverse direction of the equatorial plane XX.

When the first gripping member 21 reaches the second operating position, the second gripping member 22
It engages near zero continuous strip-like elements 2a.

Next, the cutting member 23 is actuated so that the cutting member is continuous in its extended part contained between the second gripping element 22 and the first guide member 20. Is cut to form a strip-shaped length 13 having a predetermined extension length “L”.

Following the cutting operation by the cutting member 23, the resulting strip-shaped element 13 is positioned transversely and centered with respect to the equatorial plane of the annular support.

Thereafter, the gripping members 21, 22 are simultaneously translated toward the geometrical axis of the annular support 11 by radially moving the strip-shaped length 13 near the annular support. Under this circumstance, the formation of the crown portion 24 takes place at the centered position of the longitudinal extension of the strip-shaped length 13, which is located radially outward on the annular support 11. To extend.

As can be clearly seen from FIG. 4, as the gripping members 21, 22 move in the radial direction, both ends of the strip-shaped length 13 become closer to the geometric rotation axis of the annular support 11. Radially up to form two side portions 25 that extend substantially in a plane perpendicular to the geometric rotation axis of the toroidal support at positions axially separated from one another.

Thereafter, when the gripping members 21 and 22 move close to the annular support 11, both ends of the strip-shaped element are securely attached to the annular support 11,
The arrangement of the length 13 is completed, this length having a generally U-shaped configuration around the profile in the cross section of the annular support.

The components intended to support and guide and move the gripping members 21 and 22 can be performed by any method convenient to those skilled in the art, and are not shown in the accompanying drawings. However, these are not important for the purpose of the present invention.

If desired, a step of pressing the strip-like length side portion 25 against the sidewall of the toroidal support 11 can be performed. For this purpose, a pair of pressure rollers, not shown, or equivalent means can be provided to act on both sides of the annular support 11. Each of the pressure rollers is arranged to act on a respective side part 25 by means of a thrust action and to be able to simultaneously slide radially towards the geometric rotation axis of the annular support 11.

Due to the tacky nature of the unvulcanized elastomeric material that forms the layer 17 covering the threadlike element 14,
Even in the absence of the liner 10 on the toroidal support,
It is ensured that the thread-like element 13 is stably adhered to the surface of the annular support 11. More particularly, as soon as the strip-shaped element 13 comes into contact with the toroidal support itself in the radially outer region of its profile in the cross-section, the abovementioned bonding takes place.

In addition to or instead of taking advantage of the natural tackiness of the elastomeric materials described above, by performing a suction action through one or more suitable holes 26 located on the toroidal support. One or more strip-like lengths 13 can be held on the toroidal support 11.

The toroidal support 11 can be rotated in an angle by moving in a step-like manner in synchronization with the operation of the positioning device 19, and the rotation method is as follows.
During each cutting operation of each of the three, the arrangement of the strip-like length with respect to the annular support takes place in a circumferentially arranged relationship with respect to the strip-like length 13 arranged before it.

In the embodiment shown schematically in the accompanying drawings, if the circumferential distribution pitch of the individual strip-like lengths 13 is equal to the width of said strip-like lengths, the angular rotation pitch of the annular support 11 Becomes equal to the width of the length.

However, the circumferential pitch of the strip-shaped length 13 can be provided to be equal to a multiple of its width. In this case, the angular operation pitch of the annular support 11 is equal to the circumferential distribution pitch.
For the purposes of the present invention, unless stated otherwise, the term "circumferential" is located in the equatorial plane XX and the annular support 11
Should be pointed out to mean the outer circumference near the outer surface.

Because of the above-described sequence of operation of the positioning device 19,
In the obtained first carcass ply 3, the crown portion 24 of each strip-like length 13 is provided on the annular support 11.
Are continuously arranged in a side-by-side relationship along a circumferentially extending portion of each, while each of the side portions 25 of each length 13 is partially connected to at least one of the length 13 side portions disposed before it. And is partially covered by at least one subsequently arranged side portion 25 of length 13. In the accompanying drawings, the overlapping area of the strip-shaped length 13 forming the first carcass ply 3 is indicated by reference numeral 13a.

As shown more clearly in FIG. 8, the side portions 25 in an overlapping relationship move toward each other in the direction of the geometrical rotation axis of the substantially annular support 11. The movement depends on the angle δ. This angle δ is determined by the width “W” of the strip-shaped element 13, the distribution pitch in the circumferential direction in each case, and the point of the maximum distance from the geometric rotation axis of the annular support 11. The value is a value correlated with the value of the maximum radius R measured.

Since the adjacent side portions 25 converge with each other, the extent to which these side portions overlap or cover each other, that is, the overlapping area 13a
Starting from the maximum value at the radially inner end of the side portion and gradually decreasing to a zero value in the transition region between the side portion 25 and the crown portion 24.

Due to the difference between the maximum radius R and the minimum radius R ′, measured at a point at a minimum distance from the geometrical axis of rotation of the toroidal support 11, the average density of the threadlike element 14, ie
The amount of thread element 14 present within a given length of the circumferential portion increases progressively as one approaches the geometrical axis of rotation.

In practice, this increase in density is due to the maximum radius R
And the minimum radius R '.

Two side parts 25 superimposed on each other
Is not only the value of the maximum radius R,
It is recognized that the individual lengths 13 are arranged in the transverse direction at an angle equal to the angle δ, which is also correlated with the width of the length 13 and the circumferential distribution pitch.

If, according to the requirements, it is desired to modify the crossing angle of the thread-like element 14, it is possible to make a continuous movement in its longitudinal extension region corresponding to the end of the strip-like element 13 obtained from the cutting operation. The pressing step can be performed on the strip-like element 2a. In this way, a wider area located at the circumferential inner edge of the formed carcass ply 3 is defined in the elongated portion of each strip-shaped length 13.

The above-mentioned pressing operation presses the continuous strip-shaped element 2a so that the continuous strip-shaped element can be pressed at the longitudinally extending portion to be formed from the side portion 25 of the individual length 13. This can be performed by the above-described guide roller 20 or an auxiliary pressure roller (not shown). By this pressing operation, the thickness of the elastomer layer 17 is reduced, and the width of the strip-shaped element 2a is expanded.
4 will move in directions away from each other.

By appropriately inclining the direction of the geometric rotation axis of the annular support 11 with respect to the direction of movement of the first gripping member 21, the crown portion 24 having a length of 13 can For a radial plane through which, for example, 0
Desirable tilt angles in the range of 25 ° to 25 ° can be provided. More specifically, if the tire 1 is provided with only one carcass ply 3, this gradient is advantageously in the range from 0 ° to 3 °, and the embodiment described in the present description. If the carcass structure consists of two carcass plies 3, 31 as in
It is more preferably in the range of from 20 to 20 °, and more preferably equal to 15 °.

The carcass structure 2 is manufactured as a whole
Attaching the non-stretchable annular structure 4 to a region near each of the circumferential inner edges of the carcass ply 3 obtained by the method described above for the purpose of forming a carcass region known as a "bead" , The beads being specially intended to secure the tire to the corresponding mounting rim. According to one preferred embodiment of the tire, the carcass ply is obtained in the manner described above.

These inextensible annular structures 4 (FIG. 1)
0) each has the form of a substantially annular body which is concentric with the geometric rotation axis of the toroidal support 11 and located at a position adjacent to the corresponding circumferential inner edge of the first carcass ply 3. And a first annular insert 27 that cannot be extended in the circumferential direction.

The first annular insert 27 is made of at least one of the long metal elements wound to form a number of substantially concentric coils 27a. Coil 27
a can be formed by a continuous spiral or concentric ring formed from the respective elongated elements.

A second annular insert 28 that is substantially inextensible in the form of a respective annular body coaxially arranged in relation to the first annular insert 27 and that cannot be extended in the circumferential direction.
Are combined with the first annular insert 27.

[0093] The second annular insert 28 also forms a number of substantially concentric coils 28a which can be formed by a continuous helical or concentric ring formed by respective elongated elements. Preferably, it is formed of at least one of the long metal elements wound around.

[0094] The second annular insert 28 preferably has a radial extension provided by the difference between the minimum inner radius and the maximum outer radius of the annular insert, the radial extension comprising the first annular insert. 27 is longer than the radial extension. At least one fill body 29 of an elastomeric material, preferably having a hardness in the range of 70 to 92 ° A Shore hardness, is interposed between the first annular insert 27 and the second annular insert 28. ing.

As will be explained in more detail below, during use of the tire, the above-described annular structure 4 is subjected to the action of the ribs under the action of a slip thrust force oriented parallel to the axis of rotation of the tire 1. Effectively opposes the tendency of the bead to rotate around its rest point above. This tendency to roll is particularly apparent when the tire is employed in a partially or fully flexed state.

To produce each of the annular structures 4, concentric coils 27a arranged in side-by-side relationship according to an outer circumference of increasing diameter around its geometric winding axis corresponding to the axis of rotation of the tire. Preferably, placing at least one elongate element includes forming a first non-extendable annular insert 27 within a mold cavity 30 defined within a mold 30a, 30b.

This step can be conveniently carried out by winding the elongated element in the swirl seat once it has been placed in the first cheek 30a of the dies 30a, 30b. It can be driven for the purpose of rotating about its own geometric axis.

Next, the second annular insert 28 is placed in the molding cavity 30. Advantageously, the formation of the second annular insert is performed in the same way as the formation of the first annular insert 27.

The step of arranging one or more elongate elements intended to form one or both of the annular inserts 27, 28 comprises the step of providing at least one unprocessed elongate element, preferably made of a metallic material. A rubber coating step of coating the vulcanized elastomeric material layer can be conveniently performed first. The at least one unvulcanized elastomeric material layer not only ensures excellent rubber-metal bonding at the elongated element itself, but also its adhesion for stable placement within the swirl seat once described above. Also promote.

The first teak 30a and / or the second teak 30a
Cheeks 30b are conveniently provided as being made of a magnetic material, or are operated in an electromagnetic manner so as to be able to conveniently aspirate and hold the respective elongate element, thereby providing the coils 27a and When the coils 28a are formed, these coils can be reliably and stably arranged.

Next, the filling body 29 is formed in the molding cavity 30. The formation of the body is accomplished by first annular inserts 27 formed in respective cheeks 30a, 30b.
This can be done conveniently by interposing a predetermined volume of at least one annular element of unvulcanized elastomeric material between the second annular insert 28 and the second annular insert 28. This annular element can be of any convenient form in cross-section, provided that the cheeks 30a, 30b are moved closer together when the mold is closed. The condition is that the volume corresponds to the internal volume of the molding chamber 30.

The annular elements are replaced with annular element cheeks 30a, 30b.
When placed between the teak, the mold cavities 30 are closed by the teak approaching each other. Under this circumstance, the volume of the molding cavity 30 is reduced and an annular element of unvulcanized elastomeric material is pressed between the first annular insert 27 and the second annular insert 28 to be deformed,
The annular element completely fills the molding cavity, thereby forming a filling body 29, which is tightly connected to a first annular insert 27 and a second annular insert.

One alternative solution described above is to use, for example, an elastomeric material introduced by spraying or any other method convenient to those skilled in the art after moving the teak 30a, 30b close to each other. Mold cavity 3
By filling 0, the filling body 29 can be formed.

Since the non-stretchable annular structure is not important for the purpose of the present invention, it is directly taken out of the molds 30a, 30b by a suitable mechanical handling device not described and attached to the first carcass ply 3 in the lateral direction. In order for this to be possible, the above-described formation of the non-stretchable annular structure 4 is advantageously performed close to the annular support 11.

According to a further preferred feature of the invention, forming the carcass structure 2 comprises at least one second
And forming the carcass ply 31 of FIG. The second carcass ply 31 is used for the first carcass ply 3.
And formed directly on the non-stretchable annular structure 4,
As clearly shown in the figures, it is advantageous for the second annular insert 28 of each annular structure 4 to be arranged in contact with the inner surface of the second carcass ply.

According to a possible alternative solution, the formation of each annular structure 4 can be achieved by forming a second carcass ply 31 and then attaching a second annular insert 28 to the filling body 29. Forming the first connected first annular insert 27 may initially be included. In this case, each of the inner portions in the circumferential direction of the second carcass ply 31 is interposed between each filling body 29 and the second annular insert 28, and the second carcass ply is
The second carcass ply is attached to the outer surface of the second carcass ply itself in contact therewith.

The second carcass plies 31 are preferably manufactured in such a way as to have their respective thread elements 32 arranged in a direction crossing the thread elements 14 belonging to the first carcass ply 3.

More specifically, the second carcass ply 3
1 is formed in the same manner as the method described above with respect to the production of the first carcass ply 3, that is, the respective strip-shaped lengths 33 are continuously arranged and continuously arranged in a circumferentially arranged relationship. The respective crown portions 3 arranged
4 and adjacent side portions 35 of strip-like length 33
This is conveniently done in such a way as to define a side part 35 which is partially covered by. In the accompanying drawings, the covering or overlapping areas of the strip-like length 33 forming the second carcass ply 31 are indicated by the reference numeral 33a.

The strip-shaped length 33 of the second carcass ply 31 is conveniently arranged in a direction intersecting the strip-shaped length 13 forming the first carcass ply. Further, the gradient of the strip-shaped length 33 of the second carcass ply 31 with respect to the equatorial plane XX is:
Strip-shaped length 13 belonging to first carcass ply 3
It is preferable to make the value approximately equal to the gradient of

In the radial tire, the belt structure 5 is currently attached to the carcass structure 2.

The belt structure 5 can be formed by any method convenient to those skilled in the art. In the illustrated embodiment, the belt structures 5 have first cords each having a cross direction. It basically comprises a belt strip 6a and a second belt strip 6b. For example,
An auxiliary belt strip 7 formed by winding at least one continuous coil into a coil arranged axially side by side on the first and second belt strips 5, 6; Superimposed on the strip.

Next, the tread band 8 and the side wall 9 obtained by any method convenient to those skilled in the art are attached to the belt structure 5.

Since the tire is formed on the annular support 11, a belt structure which can be advantageously implemented,
Embodiments of sidewalls and tread bands are described in European Patent Application No. 97830632.
No. 2.

After removal from the support 11, the manufactured tire 1 can be subjected to any known and conventional vulcanization treatment step.

According to one possible alternative solution, before the vulcanization step, in addition to or instead of the liner 10, a closed tubular section air tube is connected to the tire 1.
Can be advantageously associated. After removing the tire from the annular support 11, an air tube is inserted into the carcass 2. This air tube, not shown in the accompanying drawings, inflates the tire after it is introduced into the vulcanization mold and supplies internal pressure. This internal pressure is such that the tire can be completely adhered to the mold walls, especially to the mold parts whose purpose is to define the longitudinal and lateral cuts 8a of the tread pattern.

According to a further preferred feature of the invention, during the vulcanization step, a stretching step is performed on the carcass plies 3, 31 and the belt strips 6a, 6b, 7, which are pretensioned and the equatorial plane X of the tire itself. According to the linear extension measured at the circumferential extension at -X, the tire is inflated, by way of example only, in the range of 2% to 5%. This stretching step may be effected by the effect of the inflation pressure of the air tube or other type of inflatable chamber or pouch employed in the vulcanizer described above.

The present invention realizes important advantages. In practice, the tire can be formed by manufacturing different components directly on an annular support. At the annular support, the tire is formed gradually, or in any case, the tire is formed very close to the annular support. In this way, all of the problems associated with manufacturing, storing, and managing semi-finished products that are common in conventional tire manufacturing processes are eliminated.

By placing each strip-like length formed by several cords embedded in one elastomer layer, one or more carcass plies are formed, resulting in significant advantages. It should be particularly recognized that First, the production time of each carcass ply can be significantly reduced as compared with the method described in the above-mentioned US Pat. No. 5,362,343. The reason is that a large number of thread-like elements or continuous strip-like elements 2a forming the length 13 can be held in each strip-like length 13, so that it is possible to arrange these numerous thread-like elements simultaneously. This is because it can be done. Employing the strip-shaped length 13 also eliminates the need to pre-arrange the liner 10 on the toroidal support. In practice, the elastomeric layer 17 employed when forming the continuous strip-shaped element 2a is itself
It is ensured that the element 2a is efficiently bonded to the toroidal support 11, so that the individual lengths 13, 33 can be reliably and stably positioned.

The positioning accuracy with respect to the strip-like lengths 13, 33 and the thread-like elements integral with the strip-like lengths depends on the vibration or similar vibrational effect that each of the strip-like elements can be transmitted by the positioning device 19. It can be further improved because it has significant structural integrity that is unaffected. In this regard,
As described in US Pat. No. 5,362,343,
It should be appreciated that arranging the individual coils can be problematic due to the vibration and / or rocking applied to the cord during the arranging step.

Furthermore, the simultaneous placement of a plurality of thread-like elements according to the invention allows the placement device 19 to operate at a slow speed as required for placing individual threads, which Further, there is a further advantage in terms of processing accuracy without impairing productivity.

Furthermore, by directly arranging the strip-shaped length in the crown direction on an annular support having a profile substantially the same as the profile of the finished tire, the density which cannot be achieved by a known method is obtained. Can be realized. This known method places the carcass ply in the form of a cylindrical sleeve and then shapes the carcass ply into an annular form. This results in a reduced thickness of the carcass ply cord arranged in the crown direction with respect to the finished tire.

In addition to the above, each of the strip-shaped elements can be stably fastened to the toroidal support by the vacuum effect created through the possible suction duct 26.
This stable fastening by vacuum pressure cannot be achieved by known methods of arranging individual cords.

If necessary, the side portions of the length of the strip-shaped element can be arranged at a moderately increased inclination angle radially with respect to the axis of the toroidal support. This makes it possible to effectively assist in inflation of the tire during the stretching step applied to the tire during the vulcanization process. In fact, during this step, the side portions 25, 35, together with the crown portions 24, 34 extending between the side portions, tend to be oriented radially to the tire.

The structure and idea of the structure of the tire are, in particular,
With respect to the carcass structure 2, in particular, in terms of structural strength near the sidewalls and the beads, where greater structural strength is usually required, and in particular, the tire has a curve. With regard to the effect of the slip thrust force occurring when running, it is possible to realize a significant improvement in behavior.

In practice, each of the carcass plies 3, 31 has a strip-like length 13, 33 overlapping each other, even when considered separately from the other carcass plies,
It should be appreciated that or partially covering allows for initial structural reinforcement in the region of the tire sidewall. Further, as described above, this reinforcement is performed in a region where the strip-shaped lengths 13 and 33 overlap each other.
This is also facilitated by the fact that the thread-like elements 14, 32 belonging to two lengths are arranged in a direction crossing each other.

The strip-shaped lengths 1 forming the first carcass ply 3 and the second carcass ply 31, respectively.
The fact that 3, 33 are oriented crosswise to one another constitutes a second reinforcement factor for the carcass structure 2.
This second reinforcement factor results from the intersecting arrangement provided for the thread elements 14, 32 belonging respectively to the first carcass ply 3 and the second carcass ply 31 and to the first and second Areas 13a, 3a covered or covered by lengths 13, 33 belonging to the carcass ply
3a resulting from the intersecting arrangement provided for 3a.

This intersecting arrangement of the superimposed regions 13a, 33a is clearly illustrated in FIG. From this figure, the overlapping regions 13 belonging to the first carcass ply 3 and the second carcass ply 31, respectively.
It can be easily understood that a, 33a defines a kind of network structure that provides exceptional structural strength to the tire. In particular, in this way, for example, the quality is improved, such as the resistance to accidental impacts on the boundaries of the pavement, etc. and the resistance of the tire to torsional stresses around the axis of rotation, which means that during acceleration and braking, In both cases, the tire is suitable for withstanding a large torque value.

In addition to the above, a structural feature of the non-stretchable annular structure 4 is such that the structural strength of the tire can be further increased in the bead and sidewall regions.

In practice, the circumferentially inextensible annular insert 27, which is tightly connected to the carcass plies 3, 31,
The presence of 28 causes a further “coupling” between the intersecting threadlike elements 14, 32 belonging to the first carcass ply 3 and the second carcass ply 31. In this way, the carcass structure 2 is further reinforced in the area corresponding to the edge bead, this reinforcement being wrapped like a slip knot around an inextensible annular insert 4, usually a "flipper". This is possible without a special need for a further strip-like insert called On the other hand, in a known technique, the flipper is used.

When FIG. 12 and FIG. 13 are compared, for example,
Under the action of the axially directed slip thrust force of the tire, which occurs when the tire runs on a curve, the improvement made by the above-mentioned structural measures with respect to the behavior of the tire can be easily recognized. Figure 1 for clarity
The oblique lines in the cross section are intentionally omitted from the tires shown in FIGS. It should also be pointed out that in order to further clarify the phenomenon caused by the slip thrust force, FIGS. 12 and 13 are made with respect to a partially bent tire.

More specifically, FIG. 12 shows a conventional tire 101 mounted on a respective rim 100, which rim is aligned with each of the tire beads.
It has a bead seat 100a, which is demarcated in the axial direction by a flange 100b defining the outer edge of the rim and a safety projection 100c.
The different components of the tire 101 are identified by the reference numerals previously employed for the corresponding parts of the tire 1 according to the invention, which are 1 to 1.
It is indicated by a reference number with 00 added.

The tire 10 manufactured according to a known technique
In 1, the carcass ply or the carcass plies are attached to the sidewall of the tire under the action of a slip thrust force T generated in parallel to the rotation axis of the tire due to friction between the tread band 108 and the ground when turning a curve. Tend to bend.

The slip thrust force T is transmitted along the one or more plies 103 of the carcass structure 102 to the inextensible annular structure 104, and the radial component Tr
And an axial component Ts. Radial component Tr
Is resisted over its entire circumferential volume by the inability of the annular structure 104 seated on each seat 100a provided within the rim 100 to extend in the circumferential direction. This axial component Ts, oriented towards the equatorial plane of the tire, causes the tire bead to
It tends to move away from 0b, and is usually resisted by the safety projection 100c. However, the radial dimension of this safety lug is quite limited,
When the axial component Ts exceeds a predetermined value, it can easily occur that the tire bead is removed from its respective sheet 100a and contracts momentarily completely, resulting in a loss of function of the tire 100. This phenomenon is also facilitated by the fact that tire beads structured according to known techniques tend to "roll" on the safety projection 100c under the action of the slip thrust force T.

The danger of the above-mentioned phenomenon of removing the bead from the sheet is that the tire must be driven in a partially contracted state, and therefore the carcass structure 102 is subject to the action of the slip thrust force. The bottom is particularly important when it is significantly deformed.

Next, referring to the tire shown in FIG. 13, the annular structure 4 of the present invention interposed between the first carcass ply 3 and the second carcass ply 31
The tire bead is prevented from rotating under the action of a slip thrust force T about its seating point on each safety projection 100c provided on the rim 100.

More specifically, the annular insert 2 which is arranged inside each of the carcass plies 3, 31 and which is in direct contact with these carcass plies and which cannot be extended in the circumferential direction.
Recognize that the presence of the annular inserts 7, 28 and the separation of the annular inserts by the interposition of the filling body 29 effectively prevents the bead from bending and rotating under the action of the slip thrust force. Should. actually,
Referring to FIG. 13, it can be understood that the slip thrust force T tends to bend the unstretchable annular structure 4 toward the equatorial plane of the tire 1. Under this circumstance, the first annular insert 27 tends to be compressed in the radial direction, while the second annular insert 28 is subjected to a tensile stress in the radial direction. However, insert 2
The individual coils 27a, 28a forming the coils 7, 28 are inextensible in the circumferential direction, and the carcass whose inserts have respective thread-like elements 14, 32 intersecting each other in the overlapping areas 13a, 33a Tight integration with the plies 3, 31 hinders the ability of the non-stretchable annular structure 4 to bend and deform almost completely.

The slip force T is equally distributed between the first and second carcass plies and includes a first non-stretchable annular element 27 and a second non-stretchable annular element 28 provided in the structure 4. To the ply.

Under these circumstances, the first annular insert 2
The portion of the slip force T transmitted along the first carcass ply 3 to near 7 causes a radial component Tr ₁ to move the bead away from the bead seat 55 and this slip force is resisted by the structure 4 is inextensible in the circumferential direction, the slip power portion causes an axial component Ts _1, pressing the bead against the circumferential flange 53, by which, the bead Maintain stable positioning.

The slip force T transmitted along the second carcass ply 31 likewise causes a radial component Tr ₂ , which means that the second annular insert 28 cannot be stretched in the circumferential direction. And also produces an axial component that presses the bead against the flange 100b, the inner component of which, as shown, is the inner peripheral edge of the second carcass ply, Takes a value substantially equal to 0 when taking a direction perpendicular to.

In any case, the above-described axial component Ts
₁ ensures that the bead is accurately positioned.

Thus, a tire having a bead formed according to the present invention can withstand the so-called "J-curve test" up to an inflation pressure of 0.5 bar without removing the bead from its sheet. A tire which, in the known art, cannot resist displacement of the bead from its seat at a pressure below 0.8 to 1.0 bar is considered acceptable.

It should also be appreciated that the annular inserts 27, 28 provide additional structural protection of the tire with beads.

When the lengths of the plies do not overlap each other, the structural strength of the sidewalls can be reduced without excessive reinforcement at the crown portion of the carcass structure, which is a place arranged in the circumferential direction. It can be advantageously increased. This feature is particularly advantageous for high performance, low profile tires where the structural strength of the sidewall is very critical due to the large torque values that the tire must be able to transmit.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of a split tire of the present invention.

FIG. 2 is a schematic view of an apparatus for manufacturing a carcass ply in a process step when viewed in a direction orthogonal to a plane of a diameter cross section of an annular support supporting a tire during a manufacturing step.

FIG. 3 is a schematic view of an apparatus for manufacturing a carcass ply in a process step different from that in FIG. 2;

FIG. 4 is a schematic view of an apparatus for manufacturing a carcass ply in a process step different from that in FIG. 2;

FIG. 5 is a schematic view of an apparatus for manufacturing a carcass ply in a process step different from that in FIG. 2;

FIG. 6 is a diagram showing the production of a continuous strip-shaped element intended to form one or more carcass plies.

FIG. 7 is a cross-sectional view of one embodiment of the strip-like element.

FIG. 8 is a partial perspective view schematically illustrating the order of arranging strip-shaped lengths for the purpose of manufacturing a first carcass ply of a tire according to the present invention.

FIG. 9 is a partial diametrical cross-sectional view of a non-stretchable annular structure inserted at a tire bead during a molding step of manufacturing a tire.

FIG. 10 is a partial perspective view of a non-stretchable annular structure mounted laterally between first and second carcass plies.

FIG. 11 shows a tire according to the invention in transverse and phantom lines, in order to clarify the superposed relationship of the individual strip-like lengths belonging to two different carcass plies to one another. It is a diagram of the carcass structure of FIG.

FIG. 12 attached to each mounting rim,
FIG. 4 is a lateral half sectional view of a conventional tire in a slip running state and a partially bent state.

FIG. 13 is a transverse half-section view of a tire according to the invention mounted on a respective mounting rim, in a slip-running state and in a partially flexed state.

[Explanation of symbols]

Reference Signs List 1 tire 2 carcass structure 3 carcass ply 4 annular structure 5 belt structure 6a, 6b, 7 belt strip 8 tread band 8a transverse cut portion 9 sidewall 10 liner 11 annular support 12 ribbon-like band 12a auxiliary Annular element 13 Strip-like length 13a Overlapping area 14 Thread-like element 14a Reel 15 First extruder 16 First extruder 17 Elastomer material layer 18 Accumulator-corrector 19 Positioning device 20 First guide member 21 First 1 gripping member 22 second gripping member 23 cutting member 24 crown portion 25 side portion 26 hole 27 first annular insert 27a, 28a concentric coil 28 second annular insert 29 filling body 30 molding cavity 30a, 30b cheek 31 Second carcass ply 32 Thread-like element 33 Strip-like length 33a Overlap area 34 Crown part 35 Side part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B60C 15/06 B60C 15/06 B // B29D 30/16 B29D 30/16

Claims (26)

[Claims] A tire for a vehicle wheel, comprising at least one carcass ply comprising thread-like elements (14) each extending in a substantially U-shaped configuration around a profile in a cross section of the tire (1). (3, 31) and a pair of circumferentially non-stretchable annular structures (4) each of which is engaged near a respective circumferential inner edge of the carcass ply (3, 31). A structure (2), a belt structure (5) attached to the carcass structure (2) at a circumferentially outer position, and a carcass structure (2) at a circumferentially outer position. A wheel tire for a vehicle, comprising: a tread band (8) attached; and at least one pair of sidewalls (9) attached to a carcass structure (2) at both lateral sides. ply( , 31), at least one unvulcanized elastomeric material layer (17)
A plurality of strip-like lengths (1) consisting of at least two thread-like elements (14, 32) arranged longitudinally and parallel to one another, at least partially covered by
3, 33) wherein the respective strip-like lengths (13, 33) extend in a substantially U-shaped configuration around a profile in the cross section of the tire (1) and are spaced apart from one another in the axial direction. Two side portions (25, 35) extending substantially in a plane perpendicular to the geometrical axis of rotation of the tire (1) at the only position, and radially outward between the side portions (25, 35). A crown portion (24, 34) extending in one direction, the crown portions (24, 34) being arranged in a side-by-side relationship along a circumferential extension of the tire (1); Side portions (25, 3) of each strip-like length (13, 33)
5), wherein each of the tires is partially covered by at least one adjacent strip-like length side portion (25, 35). 2. The tire according to claim 1, wherein said strip-like lengths (13, 33) have side portions (2, 3).
5, 35) tires which converge with each other at the geometrical axis of rotation of the tire (1). 3. The tire according to claim 1, wherein the side portions have a strip-like length.
35) the extent of coverage progressively starting from the maximum value of the radially inner end of the side part to a value of zero in the transition region between said side part (25, 35) and the crown part (24, 34). Tires. 4. The tire according to claim 1, wherein the individual strip-like lengths (13, 33) are arranged on the tire (1) according to a circumferential distribution pitch corresponding to the width of the strip-like length itself. Tires. 5. The tire according to claim 1, wherein the individual strip-like lengths (13, 33) are arranged on the tire (1) according to a circumferential distribution pitch corresponding to a multiple of the width of the strip-like length. Be tired. 6. The tire according to claim 1, wherein each strip-like length (13, 33) corresponds to a divisor of the circumferential extension of the tire (1) measured at its equatorial plane. Having a tire. 7. The tire according to claim 1, wherein the side portions have a strip-like length.
35) The tire having a wide area near the circumferential inner edge of the carcass structure (2). 8. The tire according to claim 7, wherein the thread-like elements (14, 32) included in each strip-like length (13, 33) are moved away from each other in the wide area. ,tire. 9. The tire according to claim 1, wherein each strip-shaped length (13, 33) is 3 mm to 20 mm.
A tire having a width in the range of mm. 10. The tire according to claim 1, wherein each strip-like length (13, 33) comprises from 3 to 10 thread-like elements (14, 32). 11. The tire according to claim 1, wherein each of the thread elements (14, 32) has a diameter of 0.6 mm to 1.0 mm.
Tire made of fiber cord with a diameter in the range of 2mm. 12. The tire according to claim 1, wherein each of the thread elements (14, 32) has a diameter of 0.3 mm to 2.0 mm.
Tire made of metal cord with a diameter in the range of 1 mm. 13. The tire according to claim 1, wherein the thread elements (14, 32) are arranged circumferentially on a carcass ply (3, 31) near an equatorial plane (XX) of the tire (1). Tires, when measured, arranged within respective strip-like lengths (13, 33) according to a density of thread-like elements of 6 or more / cm. 14. The tire according to claim 13, wherein the thread-like elements (14, 32) have respective strip-like lengths according to their mutual distance between centers of at least 1.5 times the diameter of the thread-like elements. 13, 33) The tire arranged in. 15. A tire for a vehicle wheel, comprising: at least one first carcass ply (3), each of which engages near a respective inner circumferential edge of the first carcass ply (3). A carcass structure (2) having a pair of annular structures (4) that cannot be stretched in the circumferential direction, and a tread band ( 8) and at least one pair of sidewalls (9) attached to the carcass structure (2) at laterally opposed positions, wherein the inextensible annular structures (4) ) Is a substantially annular body in the form of a substantially annular body disposed coaxially with the tire and adjacent to the circumferential inner edge of the first carcass ply (3). 27)
Wherein the first annular insert (27) having at least one elongated element extending in the shape of a concentric coil (27a), and axially separated from the first annular insert (27). A second annular insert (2) which is substantially in the form of an annular body arranged coaxially with the tire at a position and which cannot be extended in the circumferential direction.
8) said second annular insert (28) formed with at least one elongate element extending in the form of a concentric coil (28a); and first and second annular fastening elements (27, 28). A) a filler body (29) of an elastomeric material interposed therebetween and tightly connected to the second annular fastening element. 16. Tire according to claim 15, wherein the carcass structure (2) comprises at least one carcass ply (31) externally attached to the first carcass ply (3). 17. The thread element according to claim 16, wherein the second carcass ply (31) is arranged in a direction intersecting the thread element (14) of the first carcass ply (3). A tire comprising (32). 18. The tire according to claim 1, wherein the second carcass ply (31) is manufactured in the same manner as the first carcass ply (3), and the first carcass ply is stripped. The strip-like lengths (3) arranged according to the direction intersecting the strip-like length (13)
A tire having 3). 19. The tire according to claim 17, wherein the carcass plies have thread-like elements.
32) wherein the tire has a direction inclined at an angle of 0 ° to 25 ° with respect to a radial plane with respect to the geometric rotation axis of the tire. 20. The tire according to claim 15, wherein the first annular insert (27) is mounted on an outer surface of the first carcass ply (3) in contact therewith. 21. The tire according to claim 16, wherein the second annular insert is inextensible in the circumferential direction.
Is attached to an inner surface of the second carcass ply (31) in a state of being in contact with the inner surface. 22. The tire according to claim 16, wherein the second annular insert is inextensible in the circumferential direction.
Is attached to the outer surface of the second carcass ply (31) in contact with the outer surface of the second carcass ply (31). Tires each having a circumferentially inner portion interposed between the second annular insert (28) and the filling body (29). 23. The tire according to claim 15, wherein the second annular insert is inextensible in the circumferential direction.
But a first annular insert (27) which is not circumferentially stretchable
A tire having a radial extension distance that is greater than the radial extension distance of the tire. 24. The tire according to claim 15, wherein the filled body of elastomeric material (29) has a hardness in the range of 70 ° to 92 ° A Shore hardness. 25. The tire according to claim 1, wherein the carcass structure (2) is impermeable to air.
A tire further comprising at least one sealing layer or liner (10) made of an elastomeric material, said sealing layer covering said carcass ply inside the tire (1). 26. The tire according to claim 25, wherein
Said sealing layer (10) is substantially at least one ribbon-like band (12) of an airtight elastomeric material, extending as coils arranged side by side along a profile in the cross section of the tire (1). It was done,
tire.